339 lines
11 KiB
PHP
339 lines
11 KiB
PHP
<?php
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/**
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* CMsCommandBuilder class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @author Christophe Boulain <Christophe.Boulain@gmail.com>
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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* @link http://www.yiiframework.com/
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* @copyright 2008-2013 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CMssqlCommandBuilder provides basic methods to create query commands for tables for Mssql Servers.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @author Christophe Boulain <Christophe.Boulain@gmail.com>
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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* @package system.db.schema.mssql
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*/
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class CMssqlCommandBuilder extends CDbCommandBuilder
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{
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/**
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* Creates a COUNT(*) command for a single table.
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* Override parent implementation to remove the order clause of criteria if it exists
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* @param CDbTableSchema $table the table metadata
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* @param CDbCriteria $criteria the query criteria
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* @param string $alias the alias name of the primary table. Defaults to 't'.
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* @return CDbCommand query command.
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*/
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public function createCountCommand($table,$criteria,$alias='t')
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{
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$criteria->order='';
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return parent::createCountCommand($table, $criteria,$alias);
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}
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/**
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* Creates a SELECT command for a single table.
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* Override parent implementation to check if an orderby clause if specified when querying with an offset
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* @param CDbTableSchema $table the table metadata
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* @param CDbCriteria $criteria the query criteria
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* @param string $alias the alias name of the primary table. Defaults to 't'.
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* @return CDbCommand query command.
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*/
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public function createFindCommand($table,$criteria,$alias='t')
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{
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$criteria=$this->checkCriteria($table,$criteria);
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return parent::createFindCommand($table,$criteria,$alias);
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}
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/**
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* Creates an UPDATE command.
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* Override parent implementation because mssql don't want to update an identity column
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* @param CDbTableSchema $table the table metadata
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* @param array $data list of columns to be updated (name=>value)
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* @param CDbCriteria $criteria the query criteria
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* @throws CDbException if no columns are being updated
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* @return CDbCommand update command.
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*/
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public function createUpdateCommand($table,$data,$criteria)
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{
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$criteria=$this->checkCriteria($table,$criteria);
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$fields=array();
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$values=array();
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$bindByPosition=isset($criteria->params[0]);
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$i=0;
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foreach($data as $name=>$value)
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{
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if(($column=$table->getColumn($name))!==null)
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{
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if ($table->sequenceName !== null && $column->isPrimaryKey === true) continue;
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if ($column->dbType === 'timestamp') continue;
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if($value instanceof CDbExpression)
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{
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$fields[]=$column->rawName.'='.$value->expression;
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foreach($value->params as $n=>$v)
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$values[$n]=$v;
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}
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elseif($bindByPosition)
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{
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$fields[]=$column->rawName.'=?';
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$values[]=$column->typecast($value);
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}
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else
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{
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$fields[]=$column->rawName.'='.self::PARAM_PREFIX.$i;
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$values[self::PARAM_PREFIX.$i]=$column->typecast($value);
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$i++;
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}
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}
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}
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if($fields===array())
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throw new CDbException(Yii::t('yii','No columns are being updated for table "{table}".',
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array('{table}'=>$table->name)));
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$sql="UPDATE {$table->rawName} SET ".implode(', ',$fields);
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$sql=$this->applyJoin($sql,$criteria->join);
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$sql=$this->applyCondition($sql,$criteria->condition);
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$sql=$this->applyOrder($sql,$criteria->order);
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$sql=$this->applyLimit($sql,$criteria->limit,$criteria->offset);
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$command=$this->getDbConnection()->createCommand($sql);
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$this->bindValues($command,array_merge($values,$criteria->params));
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return $command;
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}
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/**
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* Creates a DELETE command.
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* Override parent implementation to check if an orderby clause if specified when querying with an offset
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* @param CDbTableSchema $table the table metadata
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* @param CDbCriteria $criteria the query criteria
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* @return CDbCommand delete command.
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*/
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public function createDeleteCommand($table,$criteria)
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{
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$criteria=$this->checkCriteria($table, $criteria);
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return parent::createDeleteCommand($table, $criteria);
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}
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/**
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* Creates an UPDATE command that increments/decrements certain columns.
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* Override parent implementation to check if an orderby clause if specified when querying with an offset
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* @param CDbTableSchema $table the table metadata
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* @param CDbCriteria $counters the query criteria
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* @param array $criteria counters to be updated (counter increments/decrements indexed by column names.)
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* @return CDbCommand the created command
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* @throws CException if no counter is specified
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*/
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public function createUpdateCounterCommand($table,$counters,$criteria)
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{
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$criteria=$this->checkCriteria($table, $criteria);
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return parent::createUpdateCounterCommand($table, $counters, $criteria);
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}
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/**
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* This is a port from Prado Framework.
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*
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* Overrides parent implementation. Alters the sql to apply $limit and $offset.
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* The idea for limit with offset is done by modifying the sql on the fly
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* with numerous assumptions on the structure of the sql string.
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* The modification is done with reference to the notes from
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* http://troels.arvin.dk/db/rdbms/#select-limit-offset
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*
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* <code>
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* SELECT * FROM (
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* SELECT TOP n * FROM (
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* SELECT TOP z columns -- (z=n+skip)
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* FROM tablename
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* ORDER BY key ASC
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* ) AS FOO ORDER BY key DESC -- ('FOO' may be anything)
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* ) AS BAR ORDER BY key ASC -- ('BAR' may be anything)
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* </code>
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*
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* <b>Regular expressions are used to alter the SQL query. The resulting SQL query
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* may be malformed for complex queries.</b> The following restrictions apply
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*
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* <ul>
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* <li>
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* In particular, <b>commas</b> should <b>NOT</b>
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* be used as part of the ordering expression or identifier. Commas must only be
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* used for separating the ordering clauses.
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* </li>
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* <li>
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* In the ORDER BY clause, the column name should NOT be be qualified
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* with a table name or view name. Alias the column names or use column index.
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* </li>
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* <li>
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* No clauses should follow the ORDER BY clause, e.g. no COMPUTE or FOR clauses.
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* </li>
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* </ul>
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*
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* @param string $sql SQL query string.
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* @param integer $limit maximum number of rows, -1 to ignore limit.
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* @param integer $offset row offset, -1 to ignore offset.
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* @return string SQL with limit and offset.
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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*/
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public function applyLimit($sql, $limit, $offset)
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{
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$limit = $limit!==null ? (int)$limit : -1;
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$offset = $offset!==null ? (int)$offset : -1;
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if ($limit > 0 && $offset <= 0) //just limit
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$sql = preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',"\\1SELECT\\2 TOP $limit", $sql);
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elseif($limit > 0 && $offset > 0)
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$sql = $this->rewriteLimitOffsetSql($sql, $limit,$offset);
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return $sql;
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}
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/**
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* Rewrite sql to apply $limit > and $offset > 0 for MSSQL database.
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* See http://troels.arvin.dk/db/rdbms/#select-limit-offset
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* @param string $sql sql query
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* @param integer $limit $limit > 0
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* @param integer $offset $offset > 0
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* @return string modified sql query applied with limit and offset.
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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*/
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protected function rewriteLimitOffsetSql($sql, $limit, $offset)
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{
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$fetch = $limit+$offset;
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$sql = preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',"\\1SELECT\\2 TOP $fetch", $sql);
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$ordering = $this->findOrdering($sql);
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$orginalOrdering = $this->joinOrdering($ordering, '[__outer__]');
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$reverseOrdering = $this->joinOrdering($this->reverseDirection($ordering), '[__inner__]');
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$sql = "SELECT * FROM (SELECT TOP {$limit} * FROM ($sql) as [__inner__] {$reverseOrdering}) as [__outer__] {$orginalOrdering}";
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return $sql;
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}
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/**
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* Base on simplified syntax http://msdn2.microsoft.com/en-us/library/aa259187(SQL.80).aspx
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*
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* @param string $sql $sql
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* @return array ordering expression as key and ordering direction as value
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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*/
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protected function findOrdering($sql)
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{
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if(!preg_match('/ORDER BY/i', $sql))
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return array();
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$matches=array();
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$ordering=array();
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preg_match_all('/(ORDER BY)[\s"\[](.*)(ASC|DESC)?(?:[\s"\[]|$|COMPUTE|FOR)/i', $sql, $matches);
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if(count($matches)>1 && count($matches[2]) > 0)
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{
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$parts = explode(',', $matches[2][0]);
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foreach($parts as $part)
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{
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$subs=array();
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if(preg_match_all('/(.*)[\s"\]](ASC|DESC)$/i', trim($part), $subs))
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{
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if(count($subs) > 1 && count($subs[2]) > 0)
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{
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$name='';
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foreach(explode('.', $subs[1][0]) as $p)
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{
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if($name!=='')
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$name.='.';
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$name.='[' . trim($p, '[]') . ']';
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}
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$ordering[$name] = $subs[2][0];
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}
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//else what?
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}
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else
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$ordering[trim($part)] = 'ASC';
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}
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}
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// replacing column names with their alias names
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foreach($ordering as $name => $direction)
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{
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$matches = array();
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$pattern = '/\s+'.str_replace(array('[',']'), array('\[','\]'), $name).'\s+AS\s+(\[[^\]]+\])/i';
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preg_match($pattern, $sql, $matches);
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if(isset($matches[1]))
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{
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$ordering[$matches[1]] = $ordering[$name];
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unset($ordering[$name]);
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}
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}
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return $ordering;
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}
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/**
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* @param array $orders ordering obtained from findOrdering()
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* @param string $newPrefix new table prefix to the ordering columns
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* @return string concat the orderings
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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*/
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protected function joinOrdering($orders, $newPrefix)
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{
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if(count($orders)>0)
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{
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$str=array();
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foreach($orders as $column => $direction)
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$str[] = $column.' '.$direction;
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$orderBy = 'ORDER BY '.implode(', ', $str);
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return preg_replace('/\s+\[[^\]]+\]\.(\[[^\]]+\])/i', ' '.$newPrefix.'.\1', $orderBy);
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}
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}
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/**
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* @param array $orders original ordering
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* @return array ordering with reversed direction.
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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*/
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protected function reverseDirection($orders)
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{
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foreach($orders as $column => $direction)
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$orders[$column] = strtolower(trim($direction))==='desc' ? 'ASC' : 'DESC';
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return $orders;
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}
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/**
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* Checks if the criteria has an order by clause when using offset/limit.
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* Override parent implementation to check if an orderby clause if specified when querying with an offset
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* If not, order it by pk.
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* @param CMssqlTableSchema $table table schema
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* @param CDbCriteria $criteria criteria
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* @return CDbCriteria the modified criteria
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*/
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protected function checkCriteria($table, $criteria)
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{
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if ($criteria->offset > 0 && $criteria->order==='')
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{
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$criteria->order=is_array($table->primaryKey)?implode(',',$table->primaryKey):$table->primaryKey;
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}
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return $criteria;
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}
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/**
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* Generates the expression for selecting rows with specified composite key values.
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* @param CDbTableSchema $table the table schema
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* @param array $values list of primary key values to be selected within
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* @param string $prefix column prefix (ended with dot)
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* @return string the expression for selection
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*/
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protected function createCompositeInCondition($table,$values,$prefix)
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{
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$vs=array();
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foreach($values as $value)
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{
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$c=array();
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foreach($value as $k=>$v)
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$c[]=$prefix.$table->columns[$k]->rawName.'='.$v;
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$vs[]='('.implode(' AND ',$c).')';
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}
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return '('.implode(' OR ',$vs).')';
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}
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}
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